Grinding-plate.



' Patena Sepl w34.

PGSSLELT. Gamms PLATE APPLIUATION FILED 21, 1914.

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nanas rossnnr, or DENVER, con'on'ano.

GBINDING-PLATE Specification of Letters atent.

Patented Sept. 1, 1914.

Application filed February 21, 1914. Serial No. 820,236.

T0 all whom t may concern:

Be it known that I, EJNAR PossnL'r, a subject oi the King of Denmark,residing;l in the city and county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Grinding-Plates, ofwhich the following is a speciieation.

This invention relates to an improvement in grinding plates, and moreparticularly to the plates which are" secured to the ends of a millbody, and the object is to provide a plate which is made of two members,the main member having a plurality oi recesses formed longitudinallythereof, in which are received wearing members. These wearing membersare removably connected to the main member, so that they can be renewedas they become worn, and in this way materially reduce, the expense ofthe upkeep of the grinding plates. lloret-etere it has been necessarywith many of the grinding plates in general use to substitute entirelynew ilates, but with this invention, it is the intention to provideblocks of a hardermetal which will reeive the greatest amount of thewear imparted to the grinding plates,so that as the blocks become worn,they can be 'removed and new blocks substituted.

The invention relates to still other novel features of construction and.combinations of parts which will be hereinafter more fully describedand pointed out in the claims.

ln the accompanyina` drawings: Figure l is a top plan View and Fig. 2 isa transverse voi-tival sectional view.

A. represents the plate, which is provided with a plurality el" coneshaped openings or orilir-.es L, l. ',l'lie greatest diameter ot theopenings is on the outer side of the plate. Located alongl the otheredge and longitudinal f ol' the plate are a plurality ot reves 2;lleeen'ed in these recesses 2 arel blocks ll which a e jnfe'fcrablyconstructed oi" manganese steel, while the plates A. may be constructedoi.t the ordinary soft steel, because thc'grealest amount of wear willbe plum-vl upon the blocks, by the action of' the balls, anal when theblocks become worn or usel'w, they can be removed and new blocks uuted.The blocks are connected to be pluies bj; wenns o bolts 3 :unl .nuts Il:

lle heads c-Ziitlw bolts being couni'ei'sunlr in countersinks formed inthe block B. The

blocks B are so constructed that they extend to the edge of the plate A.At each end of the plate, flanges 4, 4:, are formed, which 'are providedwith holes 5, whereby the plates can be fastened to the ends of the drumor mill. These flanges project below the outer side of the plate somedistance and at one end the plate curves upwardly, as at 6. Located atthe te portion of the 'plate is a downwardly extending lip 7,

which is adapted to be received beneath the heel portion of an adjacentplate. The curved surface 6 affords provision whereby the lip can beinserted beneath the plate,

The fact that the plate is composed of several pieces so arranged as toutilize different materials in the dierent places, these materialsto beof the most suitable kind for the services on them in the variouspositions, makes a distinct departure from the ordinary plate used.

The bolts which fasten the several members of the platestogether are asnearly as practicable in the centerot the block, so that they will besubjected to the blows of `the-balls, and thereby are under a uniformstress from the tension caused by the bulging of the block.

I claim:

1. In a ball mill, the combination with a plurality of stepped oroverlapping grinding plates, each having a plurality of dischargeopenings formed therein, and blocks fastened to the plates in apositionf to receive the greatest amount of wear during the grindingoperation.

2. The combination with a zgrinding mill having stepped grinding platesprovided with a plurality oi' discharge orifices, said plates havingrecesses therein, a block received in each recess for relieving thestrain and wear of the plate, and means for removably connecting theblocks t0 the plates. i i

In testimony whcreotI I allix my signature, in the presence of twowitnesses.

j EJNR POSSELT.

lllitncsses z l). lflocnn VVILsea I Cir/rurais A. M. l ALL.

